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Loans (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total number of loans | loan 24   24   29
90 or greater days delinquent $ 3,782   $ 3,782   $ 7,705
Total non-accrual loans 4,442   4,442   8,374
Deferred loan fees and premiums include net deferred fees paid by customers 2,800   2,800   2,700
Offset by net deferred premiums paid to purchase loans 3,600   3,600   3,100
Loan portfolio 1,142,010 $ 1,005,068 1,142,010 $ 1,005,068 1,088,982
Allowance for loan loss 10,434   10,434   $ 9,860
Decrease In Non Accrual Loans     $ 3,900    
Loans added to troubled debt restructuring | loan     0   1
Loans removed from troubled debt restructuring | loan     1   9
Amount of loans added to troubled debt restructuring         $ 196
Amount of loans removed from troubled debt restructuring     $ 167   2,100
Interest income recognized on outstanding TDR loans     181   357
TDR loan principal curtailment     177   1,600
Charge-offs 68 69 216 468  
Loans, carrying amount 1,132,429   1,132,429   1,079,519
Non-accrual performing loans 660   660   669
Past Due $ 4,863   $ 4,863   $ 8,739
Number of TDR loans | loan     20   22
Number of accrual TDR loans | loan 16   16   16
Financing receivable post modification recorded investment $ 11,981   $ 11,981   $ 15,121
Accrual TDR loans 10,228   10,228   10,448
Residential Development Project [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Decrease In Non Accrual Loans     2,800    
Financing Receivable Troubled Debt Restructuring [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Increase (decrease) in loans 2,800   $ (3,100)    
Nine Troubled Debt Restructuring Loans with Reserves [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio         5,700
Specific reserves for TDR loans         $ 844
Number of TDR loans | loan         9
Five Troubled Debt Restructuring Loans with Reserves [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of TDR loans | loan     4    
Ten Troubled Debt Restructuring Loans With Reserves [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 5,800   $ 5,800    
Specific reserves for TDR loans 728   $ 728    
Number of TDR loans | loan     9    
Four Troubled Debt Restructuring Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total non-accrual loans $ 1,800   $ 1,800    
Six Trouble Debt Restructuring Loans With Reserves [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total non-accrual loans         $ 4,700
Number of TDR loans | loan         6
Eleven Loans Representing Six Customer Relationships [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total number of loans | loan 11   11    
Total non-accrual loans $ 3,100   $ 3,100    
Percentage Status Of Non Accrual Loans     71.00%    
Fifteen Loans Representing Six Customer Relationships [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total number of loans | loan         15
Total non-accrual loans         $ 6,400
Percentage Status Of Non Accrual Loans         77.00%
Nonaccrual Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage status of loan in portfolio 0.39%   0.39%   0.77%
Nonaccrual Loans With No Impairment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, nonperforming, nonaccrual of interest $ 3,800   $ 3,800   $ 7,800
Interest income recognized on outstanding TDR loans     183   947
Nonaccrual Loans With Impairment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, nonperforming, nonaccrual of interest 689   689   575
Interest income recognized on outstanding TDR loans     80   156
31 - 60 Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 39   39   503
61 - 89 Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 1,042   1,042   531
90 or Greater Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 3,782   3,782   7,705
Residential First Mortgage Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Purchased Loans     19,000   64,200
Loan portfolio 181,386 148,138 181,386 148,138 171,004
Past Due 624   $ 624   $ 623
Number of TDR loans | loan     2   2
Financing receivable post modification recorded investment 537   $ 537   $ 545
Residential First Mortgage Loans [Member] | Minimum [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Debt maturity period     10 years    
Residential First Mortgage Loans [Member] | Maximum [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Debt maturity period     30 years    
Residential First Mortgage Loans [Member] | Performing Financing Receivable [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 181,098   $ 181,098   170,381
Residential First Mortgage Loans [Member] | Nonperforming Financing Receivable [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 288   288   623
Residential First Mortgage Loans [Member] | 61 - 89 Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 336   336    
Residential First Mortgage Loans [Member] | 90 or Greater Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due $ 288   $ 288   $ 623
Residential Rentals Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total number of loans | loan 3   3   4
90 or greater days delinquent $ 332   $ 332   $ 577
Total non-accrual loans $ 332   $ 332   $ 577
Construction And Land Development Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total number of loans | loan 1   1   2
90 or greater days delinquent $ 252   $ 252   $ 3,048
Total non-accrual loans 252   252   3,048
Home Equity And Second Mortgage Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 20,847 22,104 20,847 22,104 21,399
Charge-offs 1   1    
Past Due 190   190   224
Home Equity And Second Mortgage Loans [Member] | Performing Financing Receivable [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 20,795   20,795   21,338
Home Equity And Second Mortgage Loans [Member] | Nonperforming Financing Receivable [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 52   52   61
Home Equity And Second Mortgage Loans [Member] | 31 - 60 Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due         130
Home Equity And Second Mortgage Loans [Member] | 61 - 89 Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 138   138   33
Home Equity And Second Mortgage Loans [Member] | 90 or Greater Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 52   52   61
Consumer Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 412 332 412 332 422
Charge-offs     2 1  
Past Due         2
Consumer Loans [Member] | Performing Financing Receivable [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 412   412   422
Consumer Loans [Member] | 61 - 89 Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due         2
Commercial Equipment Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 34,589   34,589   39,737
Past Due 533   533   693
Commercial Equipment Loans [Member] | 31 - 60 Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 39   39   42
Commercial Equipment Loans [Member] | 61 - 89 Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 27   27   1
Commercial Equipment Loans [Member] | 90 or Greater Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 467   467   650
Real Estate Portfolio Segment [Member] | Adjustable Rate Residential First Mortgage [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio $ 59,600   $ 59,600   $ 45,600
Percentage status of loan in portfolio 5.20%   5.20%   4.20%
Real Estate Portfolio Segment [Member] | Residential First Mortgage Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total number of loans | loan 3   3   4
90 or greater days delinquent $ 288   $ 288   $ 623
Total non-accrual loans $ 288   $ 288   $ 623
Real Estate Portfolio Segment [Member] | Home Equity And Second Mortgage Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total number of loans | loan 2   2   2
90 or greater days delinquent $ 52   $ 52   $ 61
Total non-accrual loans 52   52   61
Commercial Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 939,365   939,365   896,157
Commercial Portfolio Segment [Member] | Unrated [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 103,153   103,153   101,733
Commercial Portfolio Segment [Member] | Pass [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 810,367   810,367   764,793
Commercial Portfolio Segment [Member] | Special Mention [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 1,019   1,019    
Commercial Portfolio Segment [Member] | Substandard [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio $ 24,826   $ 24,826   29,494
Commercial Portfolio Segment [Member] | Doubtful [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio         $ 137
Commercial Portfolio Segment [Member] | Commercial Real Estate Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total number of loans | loan 7   7   7
90 or greater days delinquent $ 2,015   $ 2,015   $ 2,371
Total non-accrual loans 2,015   2,015   2,371
Loan portfolio 713,789 608,380 713,789 608,380 667,105
Past Due 2,472   $ 2,472   $ 2,855
Number of TDR loans | loan     9   8
Financing receivable post modification recorded investment 9,466   $ 9,466   $ 9,587
Commercial Portfolio Segment [Member] | Commercial Real Estate Loans [Member] | Minimum [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Debt maturity period     3 years    
Commercial Portfolio Segment [Member] | Commercial Real Estate Loans [Member] | Maximum [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Debt maturity period     20 years    
Commercial Portfolio Segment [Member] | Commercial Real Estate Loans [Member] | Unrated [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 53,423   $ 53,423   51,503
Commercial Portfolio Segment [Member] | Commercial Real Estate Loans [Member] | Pass [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 639,970   639,970   594,768
Commercial Portfolio Segment [Member] | Commercial Real Estate Loans [Member] | Special Mention [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 1,019   1,019    
Commercial Portfolio Segment [Member] | Commercial Real Estate Loans [Member] | Substandard [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 19,377   19,377   20,834
Commercial Portfolio Segment [Member] | Commercial Real Estate Loans [Member] | 61 - 89 Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 457   457   484
Commercial Portfolio Segment [Member] | Commercial Real Estate Loans [Member] | 90 or Greater Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 2,015   2,015   2,371
Commercial Portfolio Segment [Member] | Residential Rentals Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 103,361 100,202 103,361 100,202 101,897
Charge-offs 42   42    
Past Due 416   $ 416   $ 588
Number of TDR loans | loan     1   1
Financing receivable post modification recorded investment 224   $ 224   $ 227
Commercial Portfolio Segment [Member] | Residential Rentals Loans [Member] | 1-4 Family Units [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 85,800   85,800   84,900
Commercial Portfolio Segment [Member] | Residential Rentals Loans [Member] | Apartment Buildings Rentals [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 17,600   17,600   17,000
Commercial Portfolio Segment [Member] | Residential Rentals Loans [Member] | Adjustable Rate Residential Rentals [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio $ 85,500   $ 85,500   $ 84,000
Percentage status of loan in portfolio 7.50%   7.50%   7.70%
Commercial Portfolio Segment [Member] | Residential Rentals Loans [Member] | Minimum [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Debt maturity period     3 years    
Commercial Portfolio Segment [Member] | Residential Rentals Loans [Member] | Maximum [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Debt maturity period     20 years    
Commercial Portfolio Segment [Member] | Residential Rentals Loans [Member] | Unrated [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio $ 26,256   $ 26,256   $ 25,563
Commercial Portfolio Segment [Member] | Residential Rentals Loans [Member] | Pass [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 76,063   76,063   74,989
Commercial Portfolio Segment [Member] | Residential Rentals Loans [Member] | Substandard [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 1,042   1,042   1,345
Commercial Portfolio Segment [Member] | Residential Rentals Loans [Member] | 61 - 89 Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 84   84   11
Commercial Portfolio Segment [Member] | Residential Rentals Loans [Member] | 90 or Greater Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 332   332   577
Commercial Portfolio Segment [Member] | Construction And Land Development Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 32,603 35,560 32,603 35,560 36,934
Charge-offs 25   25 73  
Past Due 252   $ 252   $ 3,048
Number of TDR loans | loan     3   4
Financing receivable post modification recorded investment 981   $ 981   $ 3,777
Commercial Portfolio Segment [Member] | Construction And Land Development Loans [Member] | Unrated [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 1,820   1,820   1,632
Commercial Portfolio Segment [Member] | Construction And Land Development Loans [Member] | Pass [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 29,801   29,801   31,525
Commercial Portfolio Segment [Member] | Construction And Land Development Loans [Member] | Substandard [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 982   982   3,777
Commercial Portfolio Segment [Member] | Construction And Land Development Loans [Member] | 90 or Greater Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due $ 252   $ 252   $ 3,048
Commercial Portfolio Segment [Member] | Commercial Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total number of loans | loan 5   5   5
90 or greater days delinquent $ 376   $ 376   $ 375
Total non-accrual loans 1,036   1,036   1,044
Loan portfolio 55,023 57,167 55,023 57,167 50,484
Charge-offs   69   394  
Non-accrual performing loans 660   660   669
Past Due 376   $ 376   $ 706
Number of TDR loans | loan     3   5
Financing receivable post modification recorded investment 665   $ 665   $ 872
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Unrated [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 11,586   11,586   11,266
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Pass [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 40,503   40,503   36,221
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Substandard [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 2,934   2,934   2,997
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | 31 - 60 Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due         331
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | 90 or Greater Days [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due $ 376   $ 376   $ 375
Commercial Portfolio Segment [Member] | Commercial Equipment Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total number of loans | loan 3   3   5
90 or greater days delinquent $ 467   $ 467   $ 650
Total non-accrual loans 467   467   650
Loan portfolio 34,589 $ 33,185 34,589 $ 33,185 $ 39,737
Charge-offs     $ 146    
Number of TDR loans | loan     2   2
Financing receivable post modification recorded investment 108   $ 108   $ 113
Commercial Portfolio Segment [Member] | Commercial Equipment Loans [Member] | Unrated [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 10,068   10,068   11,769
Commercial Portfolio Segment [Member] | Commercial Equipment Loans [Member] | Pass [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio 24,030   24,030   27,290
Commercial Portfolio Segment [Member] | Commercial Equipment Loans [Member] | Substandard [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio $ 491   $ 491   541
Commercial Portfolio Segment [Member] | Commercial Equipment Loans [Member] | Doubtful [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio         $ 137
Commercial Portfolio Segment [Member] | Commercial Construction Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage status of loan in portfolio 5.90%   5.90%   9.30%